# US 2014/0207259 A1 · Machine control panel

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- Number: US 2014/0207259 A1
- Document ID: US20140207259A1
- Status: Published application
- Kind: A1
- Application number: 14/156,003
- Filed: 2014-01-15
- Published: 2014-07-24
- Earliest claimed: 2013-01-18
- Assignees: Fanuc Corporation
- Applicants: FANUC Corporation
- Inventors: Yuuki KUROKAWA; Yasushi NOMOTO
- Web page: https://patentgrep.com/patent/US20140207259A1

## CPC

- G05B 19/406: characterised by monitoring or safety (G05B19/19 takes precedence)
- G05B 9/03: with multiple-channel loop, i.e. redundant control systems
- G05B 19/409: characterised by using manual data input [MDI] or by using control panel, e.g. controlling functions with the panel; characterised by control panel details or by setting parameters (G05B19/408, G05B19/4093 take precedence)
- G05B 2219/24184: Redundant I-O, software comparison of both channels
- G05B 2219/25163: Transmit twice, redundant, same data on different channels, check each channel
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)

## Abstract

A key switch on a machine control panel is provided with two contacts such that the machine control panel can include two independent communication circuits. Signals from a double-contact key switch are received by the two communication circuits, and safety-related signals are transmitted from the communication circuits to a numerical controller through a bus. The signals received by the numerical controller are compared with each other so that they can be made to comply with the safety standards by monitoring the integrity of the safety function.

## Claims

### Claim 1

A machine control panel connected to a numerical controller for controlling a machine tool and configured to operate the machine tool, comprising:
a key switch provided on the machine control panel;
first and second contacts configured to be turned on when the key switch is depressed;
a first communication circuit connected to the first contact and configured to receive a signal of the key switch;
a second communication circuit connected to the second contact and configured to receive a signal of the key switch;
a transmission line connecting the first and second communication circuits and configured to transmit the signal of the second communication circuit to the first communication circuit; and
a transmission line configured to transmit the signals of the first and second communication circuits from the first communication circuit to the numerical controller.

### Claim 2 (depends on 1)

The machine control panel according to claim 1, further comprising a first input circuit and a second input circuit capable of receiving external signals of two systems, wherein the first and second input circuits are connected to the first and second communication circuits, respectively.

### Claim 3 (depends on 1)

The machine control panel according to claim 1, further comprising a first output circuit connected to the first communication circuit and a second output circuit connected to the second communication circuit, wherein signals received from the numerical controller are output to the outside from the first and second output circuits through the first and second communication circuits, respectively.